Platen printing-press.



M. ROCKST'ROH.

PLATEN PRINTING PRESS.

APPLIOATION FILED JUNE 1o, 1913.

1,1 18,054. Patented Nov. 24, 1914.

, a i' Figi [l 1 f /f/f, C 4s W d I o MAX ROCKSTROH, OF KLEIN-SEDLITZ, NEAR PIRNA, GERMANY.

PLATEN PRIN 'LING-PRESS.

specification f Letters Patent.

Patented Nov. 24, 1914.

Application filed .Tune 10, 1913. Serial N o. 772,845.

To all whom t may concern Be it known that I, MAX Roons'rnori, a citizen of the German Empire, and residing at Klein-Sedlitz, near Pirna, Saxony, Germany, have invented certain new and useful Improvements in Platen Printing-Presses, of which the iollowing is aspecification.

My invention relates to platen printing presses, and a primary object is to provide an improved device for counterbalancing the weight of the roller carriage in such presses. To this end, I provide on the rock shaft for driving the roller carriage a toothed segment which meshes with another toothed segment which is under the inuence of a spring-pressed rod mounted in the frame of the machine. A. ball-bearing is arranged between the latter toothed segment and the spring-pressed rod for diminishing the friction. Devices are already well known in which the weight of the roller carriage is counterbalanced by ya spring. These devices, however, comprise many pivotally connected members in order to convert the movement of the rock shaft into the stroke of the spring. Such devices are consequently complicated; they soon suifer from back lash and then work ineXaotly, so that they are unsuitable for the presses.

One illustrative embodiment of my invention is represented by way of example in the accompanying drawing, wherein Figure l is a side elevation showing one form of my device, part of the frame of the press being broken away, and Fig. 2 is a horizontal section through the same.

Referring to the drawing, the roller carriage is controlled by the rod a which is driven by the rocking arm fast on the rock shaft c. Fast on this shaft is the toothed segment Z which meshes in a toothed segment e rotatable about the pivot f mounted in the frame g of the machine.

The toothed segment c has a lever-arm 7L which carries a bush z' in which a spherical head le provided on the spring-pressed rod Z can lie. rlhis rod is guided in a bracket m onthe frame g and is under the action disturbances 1n working, such as so fre' quently occur with the arrangements known heretofore comprising bolts, forks and the like, are impossible. The sole member which is subjectedto material wear in the above described arrangement is the spring n which can be readily replaced by `another spring, so that the proper motion of the roller carriage is always guaranteed.

1. In a platen printing press, the combination with the frame, a rock shaft journaled therein, and a rocking arm fast on the shaft for controlling the roller carriage, of a toothed segment fast on the shaft, a second toothed segment journaled inthe frame and meshing in the former segment, and a spring-pressed rod having a spherical head constantly acting on and tending to rotate said second segment.

2. In a platen printing press, the combination with vthe frame, a rock shaft journaled therein, and a rocking arm 'fast on the shaft for controlling the roller carriage of a toothed segment fast on the shaft, a second toothed segment journaled in the frame, meshing in the former segment and having a leverarm, a bush in the lever-arm, a rod having .t spherical head resting in said bush, and a spring acting on said rod and 1enlling to hold the head thereof in said In testimony whereof, I afHX my signature in the presence of two witnesses.

MAX ROCKSTROH.

Witnesses PAUL ARRAS, CLRE SIMON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. y 

